title: Epidemic typhus (Rickettsia prowazekii) in Massachusetts: evidence of infection.
mesh_terms: D000328:Adult; D000818:Animals; D004199:Disease Vectors; D006801:Humans; D008297:Male; D008404:Massachusetts; D012281:Rickettsia / Q000276:immunology; D012283:Rickettsia prowazekii / Q000276:immunology; D012286:Rickettsia typhi / Q000276:immunology; D012589:Sciuridae / Q000469:parasitology*; D005423:Siphonaptera / Q000382:microbiology; D014438:Typhus, Epidemic Louse-Borne / Q000175:diagnosis / Q000453:epidemiology* / Q000276:immunology / Q000635:transmission